Slotting-machine.



0. G. CURTIS. SLOITING MACHINE. APPLICATION FILED 0013, p02. RENEWEDArms, 1906.

91 1,944,. Patented Feb. 9, 1909.

4 SHEETS-SHEET 1.

f Witnesses: v Invenlnr Aifomeys G." G. CURTIS.

SLOTTING MACHINE. IAPPLIOATION FILED 0013, 1902. nnngwnn APR. e, 1906.

911,944. I I I Patented Fb.9, 1909.

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an I I W illlllllllllllllllll1ll" IIIIHIIIIHHINMMIiIIiiWWIIVIIIIIIIIIWI)fi Attorneys I i a l I I 1 I I I I I I V I s I l yi I I I l I l I I l I I I I I "l 1 M I 0. e, CURTIS. SLOTTING MAGHINE.

f APPILIOATION FILED 00m, 1902. nnnnwn'p Arms, 1006.

. Patented Feb. 9; 1-909,

I W W4 A 0. G. CURTIS.

SLOTTING MACHINE.

. APPLIOATION FILED 00T.3, 1902. RENEWED APR. 6, 1906.

Patented Feb. 9, 1909.

4 SHEETS-SHEET 4.

Witnesses;

CHARLES e. oimgris, OF NEW YORK,

N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO GENERAL ELECTRIC COMPANY, ACORPORATION 'OF NEW YORK.

SLOTTINGMAGHINE.

specifieatio'n of Letters Patent.

Patented Feb. 9, 1909.

Application filed October 3, 1902, Serial No. 125,766. Renewed April 6,1906. Serial No. 310,264.

To all whom it may concern:

Be it knownthat I, OHARLns G. CURTIS, a citizen ofthe United States,residing in the borough of Manhattan, city of New York, State of NewYork, have invented a certain new and useful Improvement in Slotting-Machines, of which the following is a specification.

My invention relates to machines for cutting curved slots across theperipheral surfaces of rings or disks or segments thereof,

more particularly to form the vane spaces of steam turbines of theCurtis type. It is an improvement upon the machine invented by Frank M.Leavitt 'and myself upon which application for patent was filed April30, 1901 (Serial No. 58,129.).

The object of the present invention ,is to produce a machine ofthischaracter which will be more accurate..=inoperatiom'will'have less lostmotion and wear, and will'be capable of being run at a higher speed.

7 In the drawing, Figure 1 is a plan view of amachine embodying mypresent invention;

Fig.2 is a side elevation of the same; Fig.3,

is an end elevation of the same taken from the end to whichpowerisapplied; Fig. 4. is a vertical-section ofthe headtof themachinetaken lengthwise through the tool s Fig.5 is a front-end elevation ofthe. ead of the machine; Eigs..6'and 7 are Views respecive y of the cams,andassociated partsifor controlling the orbital and axial movementsofthe tool,-taken on lines 6...6 and 'Z--7 in Fig. 4;; and Fig, -8 is aperspective view of the plates for holding. the tool spin le againstlongitudinal movement while the tool is cutting'the work, these platesbeing shown as separated.

1 is the frame carrying the cutting mechanism, from which extends a bed2 carrying the 'work to be cut. The work-carrier is divided into twoparts, 3, 4, the former supporting the shaft of the index plate 5 whichis vertically adjustable thereon. The work is clamped to the indexplate, The art 4 of the car 'er has a laterally adjustab e clamp 6 whicclamps the inner edgeof the index plate so as, to fix'the position of'the work with relation .toxthee' tt g ool. The. parts 3 and 4 of thecarrier are connected together rier is given an intermittent feedmovement indl 1 The link 19 is so as to advance the work after each cutby a screw 9, which is intermittently rotated .by

rocation. The sleeve 12 is in turn mounted eccentrically in a stilllarger sleeve o'r barrel 13 in which it has a movement of rotation only,while the outside sleeve or barrel 13 is supported by and rotated inbearings 14 mounted on the frame 1. The barrel 13 carries a gear 15connected by suitable gearing with the driving pulley 16 by means ofwhich the barrel is rotated, and also the sleeve 12 and tool spindle 11,causing the tool spindle by reason of its eccentric mounting to describea circular path about the center of rotation. The sleeve 12 is connectedwith the barrel 13 so asto be turned bodily thereby, and at .the sametime this connection permits the sleeve to be turned in the barrel so asto move the tool spindle towards and away fromthe center of rotation andthereby vary the path described by the tool in the Workto theextentdesired froma true circle.

The rotarymovement of the sleeve within and independent of the barreliscontrolled by a cam and prod es-t e orbi al m m n .0 .the tool asdescribed in theapplication for patent already referred to.

By mounting the tool spindle eccentrically inasurrounding sleeve carriedby the rotating barrel and varying the curvature ofthe path described bythe tool by turning this sleeve, ar'nore rigid and desirableconstruction is produced than that described in said application. Tothis end, the sleeve 12 on its end away from the cutting tool isprovided with an-arm 17 which is connected by pivoted links 18, 19 (Fig.6) with a plate 20 bolted to the adjacent end of the barrel 13. rovidedwith a roller 21 which engages a ed cam groove 22 formed in a plate 23supported by thestationary housing 24. This orbital cam 22 is properlyshaped so as to produce the desire rotary movement of the sleeve 12 inthe barrel 13.

The axial movement of the tool spindle to maintain the cu ting "edges ofthe tool .normall-to the cut notwithstanding the .va riation of itsmovement fiom a true circle,

is produced by a stationary cam 25 also supported by the housing 24. Theplate 20 which is bolted to the end of the barrel 13 is connected with ablock 26 mounted on the tool spindle 11 and turning therewith by meansof pivoted links 27, 28 (Fig. 7), the latter carrying a roller 29 whichengages the axial cam 25. The block 26 while turntion referred to.

F or reciprocating the tool spindle so as to retract the tool during thereturn portion of its revolution and to hold the tool forward in thework while cutting, I provide special devices. Upon the outer end of thetool spindle is secured-a coupling block 31, to

which is connected an arm 32 by means of a link- 33 and ball-and-socketjoints. The connection of-the link'33 with the block 31 is'madeapproximately in line with the center of rotation of the barrel 13. Thearm 32 extends from a rock-shaft 34 supported in bearings transverselyupon the frame 1. The outer end of the rock-shaft 34 has a shorter arm35 carrying a roller engagin with a cam oove36 in a plate 37 mounte upona sha t which is driven by gearing from the drivin tracting cam 36 isproperly shaped so as. to turn the rock-shaft 34, throwing back the arm32 and pulling back the tool spindle after the tool has completed itsout. The tool is thereby caused to clear the work on the return portionof its revolution, after which the retractin cam acts to push forwardthe tool spin le so that the tool will engage the work for a new cut. Tohold the tool forward in the work without relying upon the retractin camand the connections between it and t e tool spindle in which there willbe more or less ,lost motion, the coupling block 31 on the outer end ofthe tool spindle has secured to it a guide plate 38 projecting radiallytherefrom and working between plates 39, 40, supported in a stationary.housing 41. The separation of the plates 39, 40, is adjusted by means ofwedges 42, &3, moved by screws. The plate 40 receives the backwardthrust of the tool spindle, and it is important therefore that itsposition should .be accurately adjusted and rigidly fixed. This isaccomplished by means of the wedges i2, 43. The guide plate 38 and thethrust plate 40 have such a width that they are in engagement onlypulley 16. The tool rewhile the tool is cutting the work and long enoughbefore and after to make the engagement certain and effective.

The operation of the machine will be understood without furtherdescription.

What I claim is 1. In a slotting machine, the combination with a mainrotating element, of an auxiliary rotating-element, carriedeccentrically by the main rotating element, a tool spindle carriedeccentrically by said auxiliary rotating element and means forrotatively-adjusting, the auxiliary element within the main elementoperated automatically by the rotati on of the parts, whereby the pathdescribed by the tool spindle will be automatically varied from a truecircle by the rotative adjustment of said auxiliary element,substantially as set forth.

2. In a slotting machine, the combination with a main rotating element,of an auxiliary rotating element carried by the main element androtatively adjustable therein,

a tool spindle carried eccentrically ,by the auxiliary element, aconnection between the main and auxiliary elements, whereby the latterwill be driven rotatively by the former, and means for automaticallyvarying said connection as the parts rotate so as to adjust theauxiliary element rotatively in the main element, substantially as setforth.

3. In a slotting machine, the combination with a main rotating element,of an auxiliary rotating element carried by the main element androtatively adjustable therein, a tool spindle carried eccentrically bythe auxiliary element, a link connection between the main and auxiliaryelements, whereby the latter will be driven by the former, and a camcoactin with said link connection to lengthen and shorten the distancebetween its ends, whereby'the auxiliary element will be ad'ustedrotatively in the main element and t e curvature of the path describedby the tool spindle will be varied, substantially as set forth.

4:. In a slotting machine, the combination with the rotating barrel, ofthe sleeve mounted therein, the tool spindle carried eccentrically bythe sleeve, and the orbital cam and connections between the barrel andsleeve for rotatively adjusting the sleeve within the barrel,substantially as set forth.

5. In a slotting machine, the combination j Substantially as set forth.

ture, of alink connection between the tool spindle and the rotatingelement which car-' ries it, and a cam-engaging such connection andlengthening and shortening the distance between its ends for rotatingthe tool spindle axially within its rotating carrier, so as to maintainits cutting-edges normal to the cut,

to retract the tool, substantially as set forth.

8. In a slotting machine, the combination with thetool spindle mountedeccentrically in a rotating support and having automaticallyeifectedorbital and axial a ustments,

said spindle being longitudinally movable in its support, of aretracting cam and a con nection between said cam and said spindleapproximately in line with the center of ro-- tationfor efiecting theretraction of the* spindle by the cam, substantially as 'set forth.

9. In a slotting machine, the combination with the tool spindle mountedeccentrically in a rotating support and having automatically eifectedorbital and axial adjustments, said spindle being longitudinally movablein a, f its support, of a retracting cam, avrockerarm moved by said cam,and a universally .jointed connection between said rocker-arm and saidspindle approximately in line with the 1tlzenter of rotation,substantially as set ort 10. In a slotting machine, the combination,

with the tool spindle carried eccentrically by a rotatingelement. ndhaving automatically efiected orbital and axial ad ustments, saidspindle being longitudinally movable in its support, of 'a retractingcam and connections for moving said spindle longitudi-.

'nally, and a thrust plate or block for holding said spindle in a fixedforward position during a portion of its rotation, substantially as setforth.

11. In a slottin machine, the combination with a, tool spind ecarriedeccentrically by a rotating support and havin automatically eflectedorbital and axial ad justments, and also 'movable longitudinally in itssupport, of a thrust plate or block adjustable by means of wedges, and aguide plate carried by said spindle which passes in front of said thrustp ate or block during a ortion of the revolution of the spindle, sustantially as set forth.

This specification signed and witnessed this 30thday of bept. 1902.

y, CHARLES G. CURTIS, Witnesses:

. JNO. Rosr TAYLoR, 'JQHN LOU IS Loreen.

